AR-15 Talk AR-15 General Interest

Reply
 
LinkBack Thread Tools Display Modes
Old 11-28-2011, 19:13   #1
Independent Field Tester
Points: 14,017, Level: 76 Points: 14,017, Level: 76 Points: 14,017, Level: 76
Activity: 0.8% Activity: 0.8% Activity: 0.8%
Last Achievements
 
Join Date: Feb 2004
Location: Southern Indiana
Posts: 957
DPMS AR .22 Bull Barrel

I received the DPMS Upper today for T & E.
I have not had a chance to shoot it. Nasty day here.
My initial impression is it appears to be a well built, solid upper.
It is totally different from the Atchison bolt system. This is a very simple, straight forward bolt system.
The upper receiver is designed for this bolt. It is not a standard AR upper receiver. Outward appearance does look like a standard receiver with the exception of a smaller ejection port.
The forward assist is a dummy plug, but is there.
The bolt will lock back manually using the existing bolt catch.
The bolt looks to be solid with a rod and spring leading to the rear bolt block.
When the upper is opened, the rear block will drop to the point where the actual bolt catches on the charging handle.
The lug on the top of the bolt keeps it from clearing the charging handle and falling out.
The charging handle has to be released to remove the bolt.
The rear block is also beveled so the upper and lower close easily without having to push the BCG in.
I really like the simplicity of the bolt system. The feed ramp is part of the barrel chamber. So it can't move which should aid in reliability.
The bolt itself reminds me of a 10/22 bolt.
Here are some quick pictures. Poor quality but I'll have time to get better ones when I do the review.
Upper as it came:

Bolt:

Ejection Port:

Rifle as I will test it

Dave N
__________________
Independent Field Tester/R & D
"Better to die for something than Live for nothing"
shadow1 is offline   Reply With Quote
Old 11-30-2011, 13:59   #2
Independent Field Tester
Points: 14,017, Level: 76 Points: 14,017, Level: 76 Points: 14,017, Level: 76
Activity: 0.8% Activity: 0.8% Activity: 0.8%
Last Achievements
 
Join Date: Feb 2004
Location: Southern Indiana
Posts: 957
As suspected the upper ran flawlessly.
It was cold so I'm sure on a warmer day I could get better results. I also tried a different optic than usual. So, to be fair, I'll mount the optic I always test with and hit the range later in the week.
The rifle ran great!. I used the supplied BDM mag, a CMMG 1st gen mag, a CMMG Gen ll mag and a BDM X mag with steel feed lips. All mags ran 100 %
I shot several types of ammo:
Fed Champion
Fed 550 Bulk
Fed Auto Match
Winchester 555
Wolf MT
Here is the range and the rifle on a CMMG lower with Mid Length Free Float


Here are some targets using a 3-9 optic with adjustable AO
Wolf MT @ 25 yards 10 shots

Wolf MT @ 50 yards 10 shots

Winchester 555 @ 25 yards


Winchester 555 @ 50 yards

As you can see, the groups opened up at 50 yards. But as I said, it was cold and I did not have my usual scope.
I was pretty happy with the fact that the rifle would shoot the Winchester bulk as well as match ammo, at least at 25 yards.
__________________
Independent Field Tester/R & D
"Better to die for something than Live for nothing"
shadow1 is offline   Reply With Quote
Old 12-07-2011, 14:28   #3
Independent Field Tester
Points: 14,017, Level: 76 Points: 14,017, Level: 76 Points: 14,017, Level: 76
Activity: 0.8% Activity: 0.8% Activity: 0.8%
Last Achievements
 
Join Date: Feb 2004
Location: Southern Indiana
Posts: 957
I found out the bolt is stainless stell and a melonite finish is applied. I'm sure this accounts for the smooth action, along with nice machining.
I'll be heading back to the range in the next couple of days using my regular rimfire testing scope.
Couple of pictures:



Note the charging handle is shorter than a standard charging handle. The cut out is narrower also which would keep rounds from hanging in the charging handle.
It's made of aluminum so any latch will work with it.
DPMS CH on top

Dave N
__________________
Independent Field Tester/R & D
"Better to die for something than Live for nothing"
shadow1 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 16:40.
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.1
All information is copyright by Perfectunion.com unless already under copyright.

This site is Gunny Approved